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https://github.com/aaru-dps/Aaru.git
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Natalia Portillo
390122ae16
Introduces constant fields for respective debug module names, replacing the hardcoded ones. This is done to standardize the naming convention, reduce redundancy and potentially avoid any typos or name mismatches across the project. This change makes the code more maintainable and easier to update in case module names need to be changed.
126 lines
4.8 KiB
C#
126 lines
4.8 KiB
C#
// /***************************************************************************
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// Aaru Data Preservation Suite
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// ----------------------------------------------------------------------------
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//
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// Filename : XENIX.cs
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// Author(s) : Natalia Portillo <claunia@claunia.com>
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//
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// Component : Partitioning scheme plugins.
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//
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// --[ Description ] ----------------------------------------------------------
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//
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// Manages XENIX partitions.
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//
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// --[ License ] --------------------------------------------------------------
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//
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// This library is free software; you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as
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// published by the Free Software Foundation; either version 2.1 of the
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// License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, see <http://www.gnu.org/licenses/>.
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//
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// ----------------------------------------------------------------------------
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// Copyright © 2011-2023 Natalia Portillo
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// ****************************************************************************/
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using System;
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using System.Collections.Generic;
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using System.Runtime.InteropServices;
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using Aaru.CommonTypes.Enums;
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using Aaru.CommonTypes.Interfaces;
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using Aaru.Console;
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using Marshal = Aaru.Helpers.Marshal;
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namespace Aaru.Partitions;
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// TODO: Find better documentation, this is working for XENIX 2 but not for SCO OpenServer...
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/// <inheritdoc />
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/// <summary>Implements decoding of XENIX partitions</summary>
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public sealed class XENIX : IPartition
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{
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const ushort PAMAGIC = 0x1234;
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const int MAXPARTS = 16;
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const uint XENIX_BSIZE = 1024;
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// Can't find this in any documentation but everything is aligned to this offset (in sectors)
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const uint XENIX_OFFSET = 977;
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const string MODULE_NAME = "XENIX partitions plugin";
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/// <inheritdoc />
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public string Name => Localization.XENIX_Name;
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/// <inheritdoc />
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public Guid Id => new("53BE01DE-E68B-469F-A17F-EC2E4BD61CD9");
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/// <inheritdoc />
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public string Author => Authors.NataliaPortillo;
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/// <inheritdoc />
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public bool GetInformation(IMediaImage imagePlugin, out List<CommonTypes.Partition> partitions, ulong sectorOffset)
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{
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partitions = new List<CommonTypes.Partition>();
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if(42 + sectorOffset >= imagePlugin.Info.Sectors)
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return false;
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ErrorNumber errno = imagePlugin.ReadSector(42 + sectorOffset, out byte[] tblsector);
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if(errno != ErrorNumber.NoError)
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return false;
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Partable xnxtbl = Marshal.ByteArrayToStructureLittleEndian<Partable>(tblsector);
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AaruConsole.DebugWriteLine(MODULE_NAME, "xnxtbl.p_magic = 0x{0:X4} (should be 0x{1:X4})", xnxtbl.p_magic,
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PAMAGIC);
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if(xnxtbl.p_magic != PAMAGIC)
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return false;
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for(int i = 0; i < MAXPARTS; i++)
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{
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AaruConsole.DebugWriteLine(MODULE_NAME, "xnxtbl.p[{0}].p_off = {1}", i, xnxtbl.p[i].p_off);
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AaruConsole.DebugWriteLine(MODULE_NAME, "xnxtbl.p[{0}].p_size = {1}", i, xnxtbl.p[i].p_size);
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if(xnxtbl.p[i].p_size <= 0)
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continue;
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var part = new CommonTypes.Partition
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{
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Start = ((ulong)((xnxtbl.p[i].p_off + XENIX_OFFSET) * XENIX_BSIZE) / imagePlugin.Info.SectorSize) +
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sectorOffset,
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Length = (ulong)(xnxtbl.p[i].p_size * XENIX_BSIZE) / imagePlugin.Info.SectorSize,
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Offset = (ulong)((xnxtbl.p[i].p_off + XENIX_OFFSET) * XENIX_BSIZE) +
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(imagePlugin.Info.SectorSize * sectorOffset),
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Size = (ulong)(xnxtbl.p[i].p_size * XENIX_BSIZE),
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Sequence = (ulong)i,
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Type = "XENIX",
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Scheme = Name
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};
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if(part.End < imagePlugin.Info.Sectors)
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partitions.Add(part);
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}
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return partitions.Count > 0;
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}
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[StructLayout(LayoutKind.Sequential, Pack = 1)]
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readonly struct Partable
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{
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public readonly ushort p_magic; /* magic number validity indicator */
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = MAXPARTS)]
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public readonly Partition[] p; /*partition headers*/
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}
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[StructLayout(LayoutKind.Sequential, Pack = 1)]
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readonly struct Partition
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{
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public readonly int p_off; /*start 1K block no of partition*/
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public readonly int p_size; /*# of 1K blocks in partition*/
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}
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} |